<pre>Network Working Group                                            D. Levi
Request for Comments: 2591                               Nortel Networks
Category: Standards Track                               J. Schoenwaelder
                                                         TU Braunschweig
                                                                May 1999


                   <span class="h1">Definitions of Managed Objects for</span>
                    <span class="h1">Scheduling Management Operations</span>

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (1999).  All Rights Reserved.

Abstract

   This memo defines a portion of the Management Information Base (MIB)
   for use with network management protocols in the Internet community.
   In particular, it describes a set of managed objects that are used to
   schedule management operations periodically or at specified dates and
   times.

Table of Contents

   <a href="#section-1">1</a>. Introduction ....................................................<a href="#page-2">2</a>
   <a href="#section-2">2</a>. The SNMP Management Framework....................................<a href="#page-2">2</a>
   <a href="#section-3">3</a>. Overview ........................................................<a href="#page-3">3</a>
   <a href="#section-3.1">3.1</a> Periodic Schedules .............................................<a href="#page-3">3</a>
   <a href="#section-3.2">3.2</a> Calendar Schedules .............................................<a href="#page-4">4</a>
   <a href="#section-3.3">3.3</a> One-shot Schedules .............................................<a href="#page-4">4</a>
   <a href="#section-3.4">3.4</a> Time Transitions ...............................................<a href="#page-4">4</a>
   <a href="#section-3.5">3.5</a> Actions ........................................................<a href="#page-5">5</a>
   <a href="#section-4">4</a>. Definitions .....................................................<a href="#page-5">5</a>
   <a href="#section-5">5</a>. Usage Examples .................................................<a href="#page-18">18</a>
   <a href="#section-5.1">5.1</a> Starting a script to ping devices every 20 minutes ............<a href="#page-18">18</a>
   <a href="#section-5.2">5.2</a> Starting a script at the next Friday the 13th .................<a href="#page-18">18</a>
   <a href="#section-5.3">5.3</a> Turning an interface off during weekends ......................<a href="#page-19">19</a>
   <a href="#section-6">6</a>. Security Considerations ........................................<a href="#page-21">21</a>
   <a href="#section-7">7</a>. Intellectual Property ..........................................<a href="#page-22">22</a>
   <a href="#section-8">8</a>. Acknowledgments ................................................<a href="#page-22">22</a>



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   <a href="#section-9">9</a>. References .....................................................<a href="#page-22">22</a>
   <a href="#section-10">10</a>. Editors' Addresses ............................................<a href="#page-24">24</a>
   <a href="#section-11">11</a>. Full Copyright Statement ......................................<a href="#page-25">25</a>

<span class="h2"><a class="selflink" id="section-1" href="#section-1">1</a>.  Introduction</span>

   This memo defines a portion of the Management Information Base (MIB)
   for use with network management protocols in the Internet community.
   In particular, it describes a set of managed objects that are used to
   schedule management operations periodically or at specified dates and
   times.

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in <a href="./rfc2119">RFC 2119</a> [<a href="#ref-19" title="&quot;Key words for use in RFCs to Indicate Requirement Levels&quot;">19</a>].

<span class="h2"><a class="selflink" id="section-2" href="#section-2">2</a>.  The SNMP Management Framework</span>

   The SNMP Management Framework presently consists of five major
   components:

   o   An overall architecture, described in <a href="./rfc2271">RFC 2271</a> [<a href="#ref-1" title="&quot;An Architecture for Describing SNMP Management Frameworks&quot;">1</a>].

   o   Mechanisms for describing and naming objects and events for the
       purpose of management. The first version of this Structure of
       Management Information (SMI) is called SMIv1 and described in STD
       16, <a href="./rfc1155">RFC 1155</a> [<a href="#ref-2" title="&quot;Structure and Identification of Management Information for TCP/IP-based Internets&quot;">2</a>], STD 16, <a href="./rfc1212">RFC 1212</a> [<a href="#ref-3" title="&quot;Concise MIB Definitions&quot;">3</a>] and <a href="./rfc1215">RFC 1215</a> [<a href="#ref-4" title="&quot;A Convention for Defining Traps for use with the SNMP&quot;">4</a>]. The
       second version, called SMIv2, is described in STD 58, <a href="./rfc2578">RFC 2578</a>
       [<a href="#ref-5" title="&quot;Structure of Management Information Version 2 (SMIv2)&quot;">5</a>], <a href="./rfc2579">RFC 2579</a> [<a href="#ref-6" title="&quot;Textual Conventions for SMIv2&quot;">6</a>] and <a href="./rfc2580">RFC 2580</a> [<a href="#ref-7" title="&quot;Conformance Statements for SMIv2&quot;">7</a>].

   o   Message protocols for transferring management information. The
       first version of the SNMP message protocol is called SNMPv1 and
       described in <a href="./rfc1157">RFC 1157</a> [<a href="#ref-8" title="&quot;Simple Network Management Protocol&quot;">8</a>]. A second version of the SNMP message
       protocol, which is not an Internet standards track protocol, is
       called SNMPv2c and described in <a href="./rfc1901">RFC 1901</a> [<a href="#ref-9" title="&quot;Introduction to Community-based SNMPv2&quot;">9</a>] and <a href="./rfc1906">RFC 1906</a> [<a href="#ref-10" title="&quot;Transport Mappings for Version 2 of the Simple Network Management Protocol (SNMPv2)&quot;">10</a>].
       The third version of the message protocol is called SNMPv3 and
       described in <a href="./rfc1906">RFC 1906</a> [<a href="#ref-10" title="&quot;Transport Mappings for Version 2 of the Simple Network Management Protocol (SNMPv2)&quot;">10</a>], <a href="./rfc2272">RFC 2272</a> [<a href="#ref-11" title="&quot;Message Processing and Dispatching for the Simple Network Management Protocol (SNMP)&quot;">11</a>] and <a href="./rfc2274">RFC 2274</a> [<a href="#ref-12" title="&quot;User-based Security Model (USM) for version 3 of the Simple Network Management Protocol (SNMPv3)&quot;">12</a>].

   o   Protocol operations for accessing management information. The
       first set of protocol operations and associated PDU formats is
       described in STD 15, <a href="./rfc1157">RFC 1157</a> [<a href="#ref-8" title="&quot;Simple Network Management Protocol&quot;">8</a>]. A second set of protocol
       operations and associated PDU formats is described in <a href="./rfc1905">RFC 1905</a>
       [<a href="#ref-13" title="&quot;Protocol Operations for Version 2 of the Simple Network Management Protocol (SNMPv2)&quot;">13</a>].

   o   A set of fundamental applications described in <a href="./rfc2273">RFC 2273</a> [<a href="#ref-14" title="&quot;SNMPv3 Applications&quot;">14</a>] and
       the view-based access control mechanism described in <a href="./rfc2275">RFC 2275</a>
       [<a href="#ref-15" title="&quot;View-based Access Control Model (VACM) for the Simple Network Management Protocol (SNMP)&quot;">15</a>].




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   Managed objects are accessed via a virtual information store, termed
   the Management Information Base or MIB.  Objects in the MIB are
   defined using the mechanisms defined in the SMI.

   This memo specifies a MIB module that is compliant to the SMIv2. A
   MIB conforming to the SMIv1 can be produced through the appropriate
   translations. The resulting translated MIB must be semantically
   equivalent, except where objects or events are omitted because no
   translation is possible (use of Counter64). Some machine readable
   information in SMIv2 will be converted into textual descriptions in
   SMIv1 during the translation process. However, this loss of machine
   readable information is not considered to change the semantics of the
   MIB.

<span class="h2"><a class="selflink" id="section-3" href="#section-3">3</a>.  Overview</span>

   The MIB defined in this memo provides scheduling of actions
   periodically or at specified dates and times. The actions can be used
   to realize on-duty / off-duty schedules or to trigger management
   functions in a distributed management application.

   Schedules can be enabled or disabled by modifying a control object.
   This allows pre-configured schedules which are activated or de-
   activated by some other management functions.

   The term `scheduler' is used throughout this memo to refer to the
   entity which implements the scheduling MIB and which invokes the
   actions at the specified points in time.

<span class="h3"><a class="selflink" id="section-3.1" href="#section-3.1">3.1</a>.  Periodic Schedules</span>

   Periodic schedules are based on fixed time periods between the
   initiation of scheduled actions. Periodic schedules are defined by
   specifying the number of seconds between two initiations. The time
   needed to complete the action is usually not known by the scheduler
   and does therefore not influence the next scheduling point.

   Implementations must guarantee that action invocations will not occur
   before their next scheduled time.  However, implementations may be
   forced to delay invocations in the face of local constraints (e.g., a
   heavy load on higher-priority tasks).  An accumulation of such delays
   would result in a drift of the scheduling interval with respect to
   time, and should be avoided.

   Scheduled actions collecting statistical data should retrieve time
   stamps from the data source and not rely on the accuracy of the
   periodic scheduler in order to obtain accurate statistics.




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<span class="h3"><a class="selflink" id="section-3.2" href="#section-3.2">3.2</a>.  Calendar Schedules</span>

   Calendar schedules trigger scheduled actions at specified days of the
   week and days of the month. Calendar schedules are therefore aware of
   the notion of months, days, weekdays, hours and minutes.

   It is possible to specify multiple values for each calendar item.
   This provides a mechanism for defining complex schedules.  For
   example, a schedule could be defined which triggers an action every
   15 minutes on a given weekday.

   Months, days and weekdays are specified using the objects schedMonth,
   schedDay and schedWeekDay of type BITS. Setting multiple bits to one
   in these objects causes an OR operation. For example, setting the
   bits monday(1) and friday(5) in schedWeekDay restricts the schedule
   to Mondays and Fridays.

   The bit fields for schedMonth, schedDay and schedWeekDay are combined
   using an AND operation. For example, setting the bits june(5) and
   july(6) in schedMonth and combining it with the bits monday(1) and
   friday(5) set in schedWeekDay will result in a schedule which is
   restricted to every Monday and Friday in the months June and July.
   Wildcarding of calendar items is achieved by setting all bits to one.

   It is possible to define calendar schedules that will never trigger
   an action. For example, one can define a calendar schedule which
   should trigger an action on February 31st. Schedules like this will
   simply be ignored by the scheduler.

   Finally, calendar schedules are always expressed in local time. A
   scalar, schedLocalTime is provided so that a manager can retrieve the
   notion of local time and the offset to GMT time.

<span class="h3"><a class="selflink" id="section-3.3" href="#section-3.3">3.3</a>.  One-shot Schedules</span>

   One-shot Schedules are similar to calendar schedules. The difference
   between a calendar schedule and a one-shot schedule is that a one-
   shot schedule will automatically disable itself once an action has
   been invoked.

<span class="h3"><a class="selflink" id="section-3.4" href="#section-3.4">3.4</a>.  Time Transitions</span>

   When a system's notion of time is changed for some reason,
   implementations of the Schedule MIB must schedule actions
   differently.  One example of a change to a system's notion of time is
   when a daylight savings time transition occurs.





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   There are two possible situations when a time transition occurs.
   First, time may be set backwards, in which case particular times will
   appear to occur twice within the same day.  These are called
   'ambiguous times'.  Second, time may be set forwards, in which case
   particular times will appear to not occur within a day.  This are
   called 'nonexistent times'.

   When an action is configured in the Schedule MIB to occur at an
   ambiguous time during a time transition, the action SHALL only be
   invoked at the first occurence of the ambiguous time.  For example,
   if an action is scheduled to occur at 2:00 am, and a time transition
   occurs at 3:00 am which sets the clock back to 2:00 am, the action
   SHALL only be invoked at the first occurence of 2:00 am.

   When an action is configured in the Schedule MIB to occur at a
   nonexistent time, the action SHOULD be invoked immediately upon a
   time transition. If multiple actions are invoked in this way, they
   SHALL be invoked in the order in which they normally would be invoked
   had the time transition not occured. For example, if an action (a) is
   scheduled at 2:05 am and another action (b) at 2:10 am, then both
   actions SHOULD be invoked at 3:00 am in the order (a),(b) if the time
   jumps forward from 2:00 am to 3:00 am.

<span class="h3"><a class="selflink" id="section-3.5" href="#section-3.5">3.5</a>.  Actions</span>

   Scheduled actions are modeled by SNMP set operations on local MIB
   variables. Scheduled actions described in this MIB are further
   restricted to objects of type INTEGER. This restriction does not
   limit the usefulness of the MIB.  Simple schedules such as on-duty /
   off-duty schedules for resources that have a status MIB object (e.g.
   ifAdminStatus) are possible.

   More complex actions can be realized by triggering a management
   script which is responsible for performing complex state transitions.
   A management script can also be used to perform SNMP set operations
   on remote SNMP engines.

<span class="h2"><a class="selflink" id="section-4" href="#section-4">4</a>.  Definitions</span>

    DISMAN-SCHEDULE-MIB DEFINITIONS ::= BEGIN

    IMPORTS
        MODULE-IDENTITY, OBJECT-TYPE, NOTIFICATION-TYPE,
        Integer32, Unsigned32, Counter32, mib-2
            FROM SNMPv2-SMI

        TEXTUAL-CONVENTION,
        DateAndTime, RowStatus, StorageType, VariablePointer



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            FROM SNMPv2-TC

        MODULE-COMPLIANCE, OBJECT-GROUP, NOTIFICATION-GROUP
            FROM SNMPv2-CONF

        SnmpAdminString
            FROM SNMP-FRAMEWORK-MIB;

    schedMIB MODULE-IDENTITY
        LAST-UPDATED "9811171800Z"
        ORGANIZATION "IETF Distributed Management Working Group"
        CONTACT-INFO
            "David B. Levi
             Nortel Networks
             4401 Great America Parkway
             Santa Clara, CA 95052-8185
             U.S.A.
             Tel: +1 423 686 0432
             E-mail: dlevi@nortelnetworks.com

             Juergen Schoenwaelder
             TU Braunschweig
             Bueltenweg 74/75
             38106 Braunschweig
             Germany
             Tel: +49 531 391-3283
             E-mail: schoenw@ibr.cs.tu-bs.de"
        DESCRIPTION
            "This MIB module defines a MIB which provides mechanisms
             to schedule SNMP set operations periodically or at
             specific points in time."
        ::= { mib-2 63 }

    --
    -- The various groups defined within this MIB definition:
    --

    schedObjects       OBJECT IDENTIFIER ::= { schedMIB 1 }
    schedNotifications OBJECT IDENTIFIER ::= { schedMIB 2 }
    schedConformance   OBJECT IDENTIFIER ::= { schedMIB 3 }

    --
    -- Textual Conventions:
    --

    SnmpPduErrorStatus ::= TEXTUAL-CONVENTION
        STATUS       current
        DESCRIPTION



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            "This TC enumerates the SNMPv1 and SNMPv2 PDU error status
             codes as defined in <a href="./rfc1157">RFC 1157</a> and <a href="./rfc1905">RFC 1905</a>. It also adds a
             pseudo error status code `noResponse' which indicates a
             timeout condition."
        SYNTAX      INTEGER {
                        noResponse(-1),
                        noError(0),
                        tooBig(1),
                        noSuchName(2),
                        badValue(3),
                        readOnly(4),
                        genErr(5),
                        noAccess(6),
                        wrongType(7),
                        wrongLength(8),
                        wrongEncoding(9),
                        wrongValue(10),
                        noCreation(11),
                        inconsistentValue(12),
                        resourceUnavailable(13),
                        commitFailed(14),
                        undoFailed(15),
                        authorizationError(16),
                        notWritable(17),
                        inconsistentName(18)
                    }

    --
    -- Some scalars which provide information about the local time
    -- zone.
    --

    schedLocalTime OBJECT-TYPE
        SYNTAX      DateAndTime (SIZE (11))
        MAX-ACCESS  read-only
        STATUS      current
        DESCRIPTION
            "The local time used by the scheduler. Schedules which
             refer to calendar time will use the local time indicated
             by this object. An implementation MUST return all 11 bytes
             of the DateAndTime textual-convention so that a manager
             may retrieve the offset from GMT time."
        ::= { schedObjects 1 }

    --
    -- The schedule table which controls the scheduler.
    --




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    schedTable OBJECT-TYPE
        SYNTAX      SEQUENCE OF SchedEntry
        MAX-ACCESS  not-accessible
        STATUS      current
        DESCRIPTION
            "This table defines scheduled actions triggered by
             SNMP set operations."
        ::= { schedObjects 2 }

    schedEntry OBJECT-TYPE
        SYNTAX      SchedEntry
        MAX-ACCESS  not-accessible
        STATUS      current
        DESCRIPTION
            "An entry describing a particular scheduled action."
        INDEX { schedOwner, schedName }
        ::= { schedTable 1 }

    SchedEntry ::= SEQUENCE {
        schedOwner          SnmpAdminString,
        schedName           SnmpAdminString,
        schedDescr          SnmpAdminString,
        schedInterval       Unsigned32,
        schedWeekDay        BITS,
        schedMonth          BITS,
        schedDay            BITS,
        schedHour           BITS,
        schedMinute         BITS,
        schedContextName    SnmpAdminString,
        schedVariable       VariablePointer,
        schedValue          Integer32,
        schedType           INTEGER,
        schedAdminStatus    INTEGER,
        schedOperStatus     INTEGER,
        schedFailures       Counter32,
        schedLastFailure    SnmpPduErrorStatus,
        schedLastFailed     DateAndTime,
        schedStorageType    StorageType,
        schedRowStatus      RowStatus
    }

    schedOwner OBJECT-TYPE
        SYNTAX      SnmpAdminString (SIZE(0..32))
        MAX-ACCESS  not-accessible
        STATUS      current
        DESCRIPTION
            "The owner of this scheduling entry. The exact semantics of
             this string are subject to the security policy defined by



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             the security administrator."
        ::= { schedEntry 1 }

    schedName OBJECT-TYPE
        SYNTAX      SnmpAdminString (SIZE(1..32))
        MAX-ACCESS  not-accessible
        STATUS      current
        DESCRIPTION
            "The locally-unique, administratively assigned name for this
             scheduling entry. This object allows a schedOwner to have
             multiple entries in the schedTable."
        ::= { schedEntry 2 }

    schedDescr OBJECT-TYPE
        SYNTAX      SnmpAdminString
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "The human readable description of the purpose of this
             scheduling entry."
        DEFVAL { ''H }
        ::= { schedEntry 3 }

    schedInterval OBJECT-TYPE
        SYNTAX      Unsigned32
        UNITS       "seconds"
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "The number of seconds between two action invocations of
             a periodic scheduler. Implementations must guarantee
             that action invocations will not occur before at least
             schedInterval seconds have passed.

             The scheduler must ignore all periodic schedules that
             have a schedInterval value of 0. A periodic schedule
             with a scheduling interval of 0 seconds will therefore
             never invoke an action.

             Implementations may be forced to delay invocations in the
             face of local constraints. A scheduled management function
             should therefore not rely on the accuracy provided by the
             scheduler implementation."
        DEFVAL { 0 }
        ::= { schedEntry 4 }

    schedWeekDay OBJECT-TYPE
        SYNTAX      BITS {



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                        sunday(0),
                        monday(1),
                        tuesday(2),
                        wednesday(3),
                        thursday(4),
                        friday(5),
                        saturday(6)
                    }
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "The set of weekdays on which the scheduled action should
             take place. Setting multiple bits will include several
             weekdays in the set of possible weekdays for this schedule.
             Setting all bits will cause the scheduler to ignore the
             weekday."
        DEFVAL { {} }
        ::= { schedEntry 5 }

    schedMonth OBJECT-TYPE
        SYNTAX      BITS {
                        january(0),
                        february(1),
                        march(2),
                        april(3),
                        may(4),
                        june(5),
                        july(6),
                        august(7),
                        september(8),
                        october(9),
                        november(10),
                        december(11)
                    }
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "The set of months during which the scheduled action should
             take place. Setting multiple bits will include several
             months in the set of possible months for this schedule.
             Setting all bits will cause the scheduler to ignore the
             month."
        DEFVAL { {} }
        ::= { schedEntry 6 }

    schedDay OBJECT-TYPE
        SYNTAX      BITS {
                        d1(0),   d2(1),   d3(2),   d4(3),   d5(4),



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                        d6(5),   d7(6),   d8(7),   d9(8),   d10(9),
                        d11(10), d12(11), d13(12), d14(13), d15(14),
                        d16(15), d17(16), d18(17), d19(18), d20(19),
                        d21(20), d22(21), d23(22), d24(23), d25(24),
                        d26(25), d27(26), d28(27), d29(28), d30(29),
                        d31(30),
                        r1(31),  r2(32),  r3(33),  r4(34),  r5(35),
                        r6(36),  r7(37),  r8(38),  r9(39),  r10(40),
                        r11(41), r12(42), r13(43), r14(44), r15(45),
                        r16(46), r17(47), r18(48), r19(49), r20(50),
                        r21(51), r22(52), r23(53), r24(54), r25(55),
                        r26(56), r27(57), r28(58), r29(59), r30(60),
                        r31(61)
                    }
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "The set of days in a month on which a scheduled action
             should take place. There are two sets of bits one can
             use to define the day within a month:

             Enumerations starting with the letter 'd' indicate a
             day in a month relative to the first day of a month.
             The first day of the month can therefore be specified
             by setting the bit d1(0) and d31(30) means the last
             day of a month with 31 days.

             Enumerations starting with the letter 'r' indicate a
             day in a month in reverse order, relative to the last
             day of a month. The last day in the month can therefore
             be specified by setting the bit r1(31) and r31(61) means
             the first day of a month with 31 days.

             Setting multiple bits will include several days in the set
             of possible days for this schedule. Setting all bits will
             cause the scheduler to ignore the day within a month.
             Setting all bits starting with the letter 'd' or the
             letter 'r' will also cause the scheduler to ignore the
             day within a month."
        DEFVAL { {} }
        ::= { schedEntry 7 }

    schedHour OBJECT-TYPE
        SYNTAX      BITS {
                        h0(0),   h1(1),   h2(2),   h3(3),   h4(4),
                        h5(5),   h6(6),   h7(7),   h8(8),   h9(9),
                        h10(10), h11(11), h12(12), h13(13), h14(14),
                        h15(15), h16(16), h17(17), h18(18), h19(19),



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                        h20(20), h21(21), h22(22), h23(23)
                    }
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "The set of hours within a day during which the scheduled
             action should take place."
        DEFVAL { {} }
        ::= { schedEntry 8 }

    schedMinute OBJECT-TYPE
        SYNTAX      BITS {
                        m0(0),   m1(1),   m2(2),   m3(3),   m4(4),
                        m5(5),   m6(6),   m7(7),   m8(8),   m9(9),
                        m10(10), m11(11), m12(12), m13(13), m14(14),
                        m15(15), m16(16), m17(17), m18(18), m19(19),
                        m20(20), m21(21), m22(22), m23(23), m24(24),
                        m25(25), m26(26), m27(27), m28(28), m29(29),
                        m30(30), m31(31), m32(32), m33(33), m34(34),
                        m35(35), m36(36), m37(37), m38(38), m39(39),
                        m40(40), m41(41), m42(42), m43(43), m44(44),
                        m45(45), m46(46), m47(47), m48(48), m49(49),
                        m50(50), m51(51), m52(52), m53(53), m54(54),
                        m55(55), m56(56), m57(57), m58(58), m59(59)
                    }
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "The set of minutes within an hour when the scheduled action
             should take place."
        DEFVAL { {} }
        ::= { schedEntry 9 }

    schedContextName OBJECT-TYPE
        SYNTAX      SnmpAdminString (SIZE(0..32))
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "The context which contains the local MIB variable pointed
             to by schedVariable."
        ::= { schedEntry 10 }

    schedVariable OBJECT-TYPE
        SYNTAX      VariablePointer
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "An object identifier pointing to a local MIB variable



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             which resolves to an ASN.1 primitive type of INTEGER."
        ::= { schedEntry 11 }

    schedValue OBJECT-TYPE
        SYNTAX      Integer32
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "The value which is written to the MIB object pointed to by
             schedVariable when the scheduler invokes an action. The
             implementation shall enforce the use of access control
             rules when performing the set operation on schedVariable.
             This is accomplished by calling the isAccessAllowed abstract
             service interface as defined in <a href="./rfc2271">RFC 2271</a>."
        ::= { schedEntry 12 }

    schedType OBJECT-TYPE
        SYNTAX      INTEGER {
                        periodic(1),
                        calendar(2),
                        oneshot(3)
                    }
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "The type of this schedule. The value periodic(1) indicates
             that this entry specifies a periodic schedule. A periodic
             schedule is defined by the value of schedInterval. The
             values of schedWeekDay, schedMonth, schedDay, schedHour
             and schedMinute are ignored.

             The value calendar(2) indicates that this entry describes a
             calendar schedule. A calendar schedule is defined by the
             values of schedWeekDay, schedMonth, schedDay, schedHour and
             schedMinute. The value of schedInterval is ignored. A
             calendar schedule will trigger on all local times that
             satisfy the bits set in schedWeekDay, schedMonth, schedDay,
             schedHour and schedMinute.

             The value oneshot(3) indicates that this entry describes a
             one-shot schedule. A one-shot schedule is similar to a
             calendar schedule with the additional feature that it
             disables itself by changing in the `finished'
             schedOperStatus once the schedule triggers an action.

             Changing a schedule's type is equivalent to deleting the
             old-type schedule and creating a new-type one."
        DEFVAL { periodic }



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        ::= { schedEntry 13 }

    schedAdminStatus OBJECT-TYPE
        SYNTAX      INTEGER {
                        enabled(1),
                        disabled(2)
                    }
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "The desired state of the schedule."
        DEFVAL { disabled }
        ::= { schedEntry 14 }

    schedOperStatus OBJECT-TYPE
        SYNTAX      INTEGER {
                        enabled(1),
                        disabled(2),
                        finished(3)
                    }
        MAX-ACCESS  read-only
        STATUS      current
        DESCRIPTION
            "The current operational state of this schedule. The state
             enabled(1) indicates this entry is active and that the
             scheduler will invoke actions at appropriate times. The
             disabled(2) state indicates that this entry is currently
             inactive and ignored by the scheduler. The finished(3)
             state indicates that the schedule has ended. Schedules
             in the finished(3) state are ignored by the scheduler.
             A one-shot schedule enters the finished(3) state when it
             deactivates itself."
        ::= { schedEntry 15 }

    schedFailures OBJECT-TYPE
        SYNTAX      Counter32
        MAX-ACCESS  read-only
        STATUS      current
        DESCRIPTION
            "This variable counts the number of failures while invoking
             the scheduled action."
        ::= { schedEntry 16 }

    schedLastFailure OBJECT-TYPE
        SYNTAX      SnmpPduErrorStatus
        MAX-ACCESS  read-only
        STATUS      current
        DESCRIPTION



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            "The most recent error that occured during the invocation of
             a scheduled action. The value noError(0) is returned
             if no errors have occurred yet."
        DEFVAL { noError }
        ::= { schedEntry 17 }

    schedLastFailed OBJECT-TYPE
        SYNTAX      DateAndTime
        MAX-ACCESS  read-only
        STATUS      current
        DESCRIPTION
            "The date and time when the most recent failure occured. The
             value '0000000000000000'H is returned if no failure occured
             since the last re-initialization of the scheduler."
        DEFVAL { '0000000000000000'H }
        ::= { schedEntry 18 }

    schedStorageType OBJECT-TYPE
        SYNTAX      StorageType
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "This object defines whether this scheduled action is kept
             in volatile storage and lost upon reboot or if this row is
             backed up by non-volatile or permanent storage.
             Conceptual rows having the value `permanent' must allow
             write access to the columnar objects schedDescr,
             schedInterval, schedContextName, schedVariable, schedValue,
             and schedAdminStatus. If an implementation supports the
             schedCalendarGroup, write access must be also allowed to
             the columnar objects schedWeekDay, schedMonth, schedDay,
             schedHour, schedMinute."
        DEFVAL { volatile }
        ::= { schedEntry 19 }

    schedRowStatus OBJECT-TYPE
        SYNTAX      RowStatus
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "The status of this scheduled action. A control that allows
             entries to be added and removed from this table.

             The miminum number of objects that need to be set during
             row creation before a row can be set to `active' are
             schedContextName, schedVariable and schedValue."
        ::= { schedEntry 20 }




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    --
    -- Notifications that are emitted to indicate failures. The
    -- definition of schedTraps makes notification registrations
    -- reversible (see STD 58, <a href="./rfc2578">RFC 2578</a>).
    --

    schedTraps OBJECT IDENTIFIER ::= { schedNotifications 0 }

    schedActionFailure NOTIFICATION-TYPE
        OBJECTS     { schedLastFailure, schedLastFailed }
        STATUS      current
        DESCRIPTION
            "This notification is generated whenever the invocation of a
             scheduled action fails."
        ::= { schedTraps 1 }

    -- conformance information

    schedCompliances OBJECT IDENTIFIER ::= { schedConformance 1 }
    schedGroups      OBJECT IDENTIFIER ::= { schedConformance 2 }

    -- compliance statements

    schedCompliance MODULE-COMPLIANCE
        STATUS      current
        DESCRIPTION
            "The compliance statement for SNMP entities which implement
             the scheduling MIB."
        MODULE      -- this module
        MANDATORY-GROUPS {
               schedGroup, schedNotificationsGroup
        }
        GROUP  schedCalendarGroup
        DESCRIPTION
            "The schedCalendarGroup is mandatory only for those
             implementations that support calendar based schedules."
        OBJECT schedType
        DESCRIPTION
            "The values calendar(2) or oneshot(3) are not valid for
             implementations that do not implement the
             schedCalendarGroup. Such an implementation must return
             inconsistentValue error responses for attempts to set
             schedAdminStatus to calendar(2) or oneshot(3)."
        ::= { schedCompliances 1 }

    schedGroup OBJECT-GROUP
        OBJECTS {
            schedDescr,



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            schedInterval,
            schedContextName,
            schedVariable,
            schedValue,
            schedType,
            schedAdminStatus,
            schedOperStatus,
            schedFailures,
            schedLastFailure,
            schedLastFailed,
            schedStorageType,
            schedRowStatus
        }
        STATUS      current
        DESCRIPTION
            "A collection of objects providing scheduling capabilities."
        ::= { schedGroups 1 }

    schedCalendarGroup OBJECT-GROUP
        OBJECTS {
            schedLocalTime,
            schedWeekDay,
            schedMonth,
            schedDay,
            schedHour,
            schedMinute
        }
        STATUS      current
        DESCRIPTION
            "A collection of objects providing calendar based schedules."
        ::= { schedGroups 2 }

    schedNotificationsGroup NOTIFICATION-GROUP
        NOTIFICATIONS {
            schedActionFailure
        }
        STATUS      current
        DESCRIPTION
            "The notifications emitted by the scheduler."
        ::= { schedGroups 3 }

    END









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<span class="h2"><a class="selflink" id="section-5" href="#section-5">5</a>.  Usage Examples</span>

   This section presents some examples how the scheduling MIB can be
   used to schedule scripts with the Script MIB [<a href="#ref-17" title="&quot;Definitions of Managed Objects for the Delegation of Management Scripts&quot;">17</a>] or to realize on-
   duty/off-duty schedules by modifying status objects of other MIB
   modules.

<span class="h3"><a class="selflink" id="section-5.1" href="#section-5.1">5.1</a>.  Starting a script to ping devices every 20 minutes</span>

   It is assumed that the schedule entry is owned by schedOwner = "joe"
   and its name is schedName = "ping". The instance identifier for the
   scheduling entry is therefore 3.106.111.101.4.112.105.110.103.

   It is further assumed that the smLaunchTable entry is owned by
   smLaunchOwner = "joe" and its name is smLaunchName = "ping-devs". The
   complete object identifier for the smLaunchStart object is therefore
   smLaunchStart.3.106.111.101.9.112.105.110.103.45.100.101.118.115. The
   script lives in the context identified by the string "engine1".

   The configuration of the scheduler entry which launches the script
   every 20 minutes would look as follows:

      schedInterval.3.106.111.101.4.112.105.110.103 = 1200

      schedValue.3.106.111.101.4.112.105.110.103 = 0
      schedContextName.3.106.111.101.4.112.105.110.103 = "engine1"
      schedVariable.3.106.111.101.4.112.105.110.103 =
        smLaunchStart.3.106.111.101.9.112.105.110.103.45.100.101.118.115

      schedType.3.106.111.101.4.112.105.110.103 = periodic(1)
      schedAdminStatus.3.106.111.101.4.112.105.110.103 = enabled(1)
      schedStorageType.3.106.111.101.4.112.105.110.103 = nonVolatile(3)
      schedRowStatus.3.106.111.101.4.112.105.110.103 = active(1)

   All the remaining columns in the schedTable represent status
   information and are not shown here.

<span class="h3"><a class="selflink" id="section-5.2" href="#section-5.2">5.2</a>.  Starting a script at the next Friday the 13th</span>

   It is assumed that the schedule entry is owned by schedOwner = "joe"
   and its name is schedName = "13th". The instance identifier for the
   scheduling entry is therefore 3.106.111.101.4.49.51.116.104.

   It is further assumed that the smLaunchTable entry is owned by
   smLaunchOwner = "joe" and its name is smLaunchName = "ghost". The
   complete object identifier for the smLaunchStart object is therefore
   smLaunchStart.3.106.111.101.5.103.104.111.115.116. The script lives
   in the context identified by the string "engine1".



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   The configuration of the scheduler entry which launches the script on
   every Friday 13th at midnight would look as follows:

      schedWeekDay.3.106.111.101.4.49.51.116.104 = { friday }
      schedMonth.3.106.111.101.4.49.51.116.104 = {
            january, february, march, april, may, june,
            july, august, september, october, november, december
      }
      schedDay.3.106.111.101.4.49.51.116.104 = { d13 }
      schedHour.3.106.111.101.4.49.51.116.104 = { h0 }
      schedMinute.3.106.111.101.4.49.51.116.104 = { m0 }

      schedValue.3.106.111.101.4.49.51.116.104 = 0
      schedContextName.3.106.111.101.4.49.51.116.104 = "engine1"
      schedVariable.3.106.111.101.4.49.51.116.104 =
        smLaunchStart.3.106.111.101.5.103.104.111.115.116

      schedType.3.106.111.101.4.49.51.116.104 = oneshot(3)
      schedAdminStatus.3.106.111.101.4.49.51.116.104 = enabled(2)
      schedStorageType.3.106.111.101.4.49.51.116.104 = nonVolatile(3)
      schedRowStatus.3.106.111.101.4.49.51.116.104 = active(1)

   All the remaining columns in the schedTable represent status
   information and are not shown here.

<span class="h3"><a class="selflink" id="section-5.3" href="#section-5.3">5.3</a>.  Turning an interface off during weekends</span>

   This example assumes that a network interface should be taken down
   during weekends. The interface table (ifTable) of the IF-MIB [<a href="#ref-18" title="&quot;The Interfaces Group MIB using SMIv2&quot;">18</a>] is
   assumed to exist in the context identified by an empty string and the
   index of the interface is ifIndex = 6.

   The scheduling entry which brings the interface down on every Friday
   evening at 20:30 (8:30 pm) is owned by schedOwner = "bob" and its
   name is schedName = "if-off". The instance identifier for the
   scheduling entry is therefore 3.98.111.98.6.105.102.45.111.102.102.

      schedWeekDay.3.98.111.98.6.105.102.45.111.102.102 = { friday }
      schedMonth.3.98.111.98.6.105.102.45.111.102.102 = {
            january, february, march, april, may, june,
            july, august, september, october, november, december
      }
      schedDay.3.98.111.98.6.105.102.45.111.102.102 = {
            d1, d2, d3, d4, d5, d6, d7, d8, d9, d10,
            d11, d12, d13, d14, d15, d16, d17, d18, d19, d20,
            d21, d22, d23, d24, d25, d26, d27, d28, d29, d30, d31
      }
      schedHour.3.98.111.98.6.105.102.45.111.102.102 = { h20 }



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      schedMinute.3.98.111.98.6.105.102.45.111.102.102 = { m30 }

      schedValue.3.98.111.98.6.105.102.45.111.102.102 = down(2)
      schedContextName.3.98.111.98.6.105.102.45.111.102.102 = ""
      schedVariable.3.98.111.98.6.105.102.45.111.102.102 =
        ifAdminStatus.6

      schedType.3.98.111.98.6.105.102.45.111.102.102 = calendar(2)
      schedAdminStatus.3.98.111.98.6.105.102.45.111.102.102 = enabled(1)
      schedStorageType.3.98.111.98.6.105.102.45.111.102.102 =
        nonVolatile(3)
      schedRowStatus.3.98.111.98.6.105.102.45.111.102.102 = active(1)

      The scheduling entry which brings the interface up on every Monday
      morning at 5:30 is owned by schedOwner = "bob" and its name is
      schedName = "if-on". The instance identifier for the scheduling
      entry is therefore 3.98.111.98.5.105.102.45.111.110.

      The entry in the schedTable which brings the interface up again on
      every Monday morning at 5:30 looks as follows:

      schedWeekDay.3.98.111.98.5.105.102.45.111.110 = { monday }
      schedMonth.3.98.111.98.5.105.102.45.111.110 = {
            january, february, march, april, may, june,
            july, august, september, october, november, december
      }
      schedDay.3.98.111.98.5.105.102.45.111.110 = {
            d1, d2, d3, d4, d5, d6, d7, d8, d9, d10,
            d11, d12, d13, d14, d15, d16, d17, d18, d19, d20,
            d21, d22, d23, d24, d25, d26, d27, d28, d29, d30, d31
      }
      schedHour.3.98.111.98.5.105.102.45.111.110 = { h5 }
      schedMinute.3.98.111.98.5.105.102.45.111.110 = { m30 }

      schedValue.3.98.111.98.5.105.102.45.111.110 = up(1)
      schedContextName.3.98.111.98.5.105.102.45.111.110 = ""
      schedVariable.3.98.111.98.5.105.102.45.111.110 = ifAdminStatus.6

      schedType.3.98.111.98.5.105.102.45.111.110 = calendar(2)
      schedAdminStatus.3.98.111.98.5.105.102.45.111.110 = enabled(1)
      schedStorageType.3.98.111.98.5.105.102.45.111.110 = nonVolatile(3)
      schedRowStatus.3.98.111.98.5.105.102.45.111.110 = active(1)

   A similar configuration could be used to control other schedules. For
   example, one could change the "if-on" and "if-off" schedules to
   enable and disable the periodic scheduler defined in the first
   example.




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<span class="grey"><a href="./rfc2591">RFC 2591</a>                     Scheduling MIB                     May 1999</span>


<span class="h2"><a class="selflink" id="section-6" href="#section-6">6</a>.  Security Considerations</span>

   Scheduled SNMP set operations must use the security credentials that
   were present when the corresponding row in the scheduling entry was
   created.  An implementation must therefore record and maintain the
   credentials for every scheduling entry.

   An implementation must ensure that access control rules are applied
   when doing the set operation. This is accomplished by calling the
   isAccessAllowed abstract service interface defined in <a href="./rfc2271">RFC 2271</a> [<a href="#ref-1" title="&quot;An Architecture for Describing SNMP Management Frameworks&quot;">1</a>]:

      statusInformation =          -- success or errorIndication
        isAccessAllowed(
        IN   securityModel         -- Security Model in use
        IN   securityName          -- principal who wants to access
        IN   securityLevel         -- Level of Security
        IN   viewType              -- read, write, or notify view
        IN   contextName           -- context containing variableName
        IN   variableName          -- OID for the managed object
             )
   The securityModel, securityName and securityLevel parameters are set
   to the values that were recorded when the scheduling entry was
   created. The viewType parameter must select the write view and the
   contextName and variableName parameters are taken from the
   schedContextName and schedVariableName values of the scheduling
   entry.

   This MIB limits scheduled actions to objects in the local MIB. This
   avoids security problems with the delegation of access rights.
   However, it might be possible for a user of this MIB to own some
   schedules that might trigger far in the future. This can cause
   security risks if the security administrator did not properly update
   the access control lists when a user is withdrawn from an SNMP
   engine. Therefore, entries in the schedTable SHOULD be cleaned up
   whenever a user is removed from an SNMP engine.

   To facilitate the provisioning of access control by a security
   administrator using the View-Based Access Control Model (VACM)
   defined in <a href="./rfc2275">RFC 2275</a> [<a href="#ref-15" title="&quot;View-based Access Control Model (VACM) for the Simple Network Management Protocol (SNMP)&quot;">15</a>] for tables in which multiple users may need
   to independently create or modify entries, the initial index is used
   as an "owner index". Such an initial index has a syntax of
   SnmpAdminString, and can thus be trivially mapped to a securityName
   or groupName as defined in VACM, in accordance with a security
   policy.

   All entries in related tables belonging to a particular user will
   have the same value for this initial index.  For a given user's
   entries in a particular table, the object identifiers for the



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   information in these entries will have the same subidentifiers
   (except for the "column" subidentifier) up to the end of the encoded
   owner index. To configure VACM to permit access to this portion of
   the table, one would create vacmViewTreeFamilyTable entries with the
   value of vacmViewTreeFamilySubtree including the owner index portion,
   and vacmViewTreeFamilyMask "wildcarding" the column subidentifier.
   More elaborate configurations are possible.

<span class="h2"><a class="selflink" id="section-7" href="#section-7">7</a>.  Intellectual Property</span>

   The IETF takes no position regarding the validity or scope of any
   intellectual property or other rights that might be claimed to
   pertain to the implementation or use of the technology described in
   this document or the extent to which any license under such rights
   might or might not be available; neither does it represent that it
   has made any effort to identify any such rights.  Information on the
   IETF's procedures with respect to rights in standards-track and
   standards-related documentation can be found in <a href="https://www.rfc-editor.org/bcp/bcp11">BCP-11</a>.  Copies of
   claims of rights made available for publication and any assurances of
   licenses to be made available, or the result of an attempt made to
   obtain a general license or permission for the use of such
   proprietary rights by implementors or users of this specification can
   be obtained from the IETF Secretariat.

   The IETF invites any interested party to bring to its attention any
   copyrights, patents or patent applications, or other proprietary
   rights which may cover technology that may be required to practice
   this standard.  Please address the information to the IETF Executive
   Director.

<span class="h2"><a class="selflink" id="section-8" href="#section-8">8</a>.  Acknowledgments</span>

   This document was produced by the IETF Distributed Management
   (DISMAN) working group.

<span class="h2"><a class="selflink" id="section-9" href="#section-9">9</a>.  References</span>

   [<a id="ref-1">1</a>]  Harrington, D., Presuhn, R. and B. Wijnen, "An Architecture for
        Describing SNMP Management Frameworks", <a href="./rfc2271">RFC 2271</a>, January 1998.

   [<a id="ref-2">2</a>]  Rose, M. and K. McCloghrie, "Structure and Identification of
        Management Information for TCP/IP-based Internets", STD 16, <a href="./rfc1155">RFC</a>
        <a href="./rfc1155">1155</a>, May 1990.

   [<a id="ref-3">3</a>]  Rose, M. and K. McCloghrie, "Concise MIB Definitions", STD 16,
        <a href="./rfc1212">RFC 1212</a>, March 1991.





<span class="grey">Levi &amp; Schoenwaelder        Standards Track                    [Page 22]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-23" ></span>
<span class="grey"><a href="./rfc2591">RFC 2591</a>                     Scheduling MIB                     May 1999</span>


   [<a id="ref-4">4</a>]  Rose, M., "A Convention for Defining Traps for use with the
        SNMP", <a href="./rfc1215">RFC 1215</a>, March 1991.

   [<a id="ref-5">5</a>]  McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose,
        M. and S. Waldbusser, "Structure of Management Information
        Version 2 (SMIv2)", STD 58, <a href="./rfc2578">RFC 2578</a>, April 1999.

   [<a id="ref-6">6</a>]  McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose,
        M. and S. Waldbusser, "Textual Conventions for SMIv2", STD 58,
        <a href="./rfc2579">RFC 2579</a>, April 1999.

   [<a id="ref-7">7</a>]  McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose,
        M. and S. Waldbusser, "Conformance Statements for SMIv2", STD
        58, <a href="./rfc2580">RFC 2580</a>, April 1999.

   [<a id="ref-8">8</a>]  Case, J., Fedor, M., Schoffstall, M. and J. Davin, "Simple
        Network Management Protocol", STD 15, <a href="./rfc1157">RFC 1157</a>, May 1990.

   [<a id="ref-9">9</a>]  Case, J., McCloghrie, K., Rose, M. and S. Waldbusser,
        "Introduction to Community-based SNMPv2", <a href="./rfc1901">RFC 1901</a>, January
        1996.

   [<a id="ref-10">10</a>] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Transport
        Mappings for Version 2 of the Simple Network Management Protocol
        (SNMPv2)", <a href="./rfc1906">RFC 1906</a>, January 1996.

   [<a id="ref-11">11</a>] Case, J., Harrington D., Presuhn R. and B. Wijnen, "Message
        Processing and Dispatching for the Simple Network Management
        Protocol (SNMP)", <a href="./rfc2272">RFC 2272</a>, January 1998.

   [<a id="ref-12">12</a>] Blumenthal, U. and B. Wijnen, "User-based Security Model (USM)
        for version 3 of the Simple Network Management Protocol
        (SNMPv3)", <a href="./rfc2274">RFC 2274</a>, January 1998.

   [<a id="ref-13">13</a>] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Protocol
        Operations for Version 2 of the Simple Network Management
        Protocol (SNMPv2)", January 1996.

   [<a id="ref-14">14</a>] Levi, D., Meyer, P. and B. Stewart, "SNMPv3 Applications", <a href="./rfc2273">RFC</a>
        <a href="./rfc2273">2273</a>, January 1998

   [<a id="ref-15">15</a>] Wijnen, B., Presuhn, R. and K. McCloghrie, "View-based Access
        Control Model (VACM) for the Simple Network Management Protocol
        (SNMP)", <a href="./rfc2275">RFC 2275</a>, January 1998.

   [<a id="ref-16">16</a>] Hovey, R. and S. Bradner, "The Organizations Involved in the
        IETF Standards Process", <a href="https://www.rfc-editor.org/bcp/bcp11">BCP 11</a>, <a href="./rfc2028">RFC 2028</a>, October 1996.




<span class="grey">Levi &amp; Schoenwaelder        Standards Track                    [Page 23]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-24" ></span>
<span class="grey"><a href="./rfc2591">RFC 2591</a>                     Scheduling MIB                     May 1999</span>


   [<a id="ref-17">17</a>] Levi, D. and J. Schoenwaelder, "Definitions of Managed Objects
        for the Delegation of Management Scripts", <a href="./rfc2592">RFC 2592</a>, May 1999.

   [<a id="ref-18">18</a>] McCloghrie, K. and F. Kastenholz, "The Interfaces Group MIB
        using SMIv2", <a href="./rfc2233">RFC 2233</a>, November 1997.

   [<a id="ref-19">19</a>] Bradner, S., "Key words for use in RFCs to Indicate Requirement
        Levels", <a href="https://www.rfc-editor.org/bcp/bcp14">BCP 14</a>, <a href="./rfc2119">RFC 2119</a>, March 1997.

<span class="h2"><a class="selflink" id="section-10" href="#section-10">10</a>.  Editors' Addresses</span>

   David B. Levi
   Nortel Networks
   4401 Great America Parkway
   Santa Clara, CA 95052-8185
   U.S.A.

   Phone: +1 423 686 0432
   EMail: dlevi@nortelnetworks.com


   Juergen Schoenwaelder
   TU Braunschweig
   Bueltenweg 74/75
   38106 Braunschweig
   Germany

   Phone: +49 531 391-3283
   EMail: schoenw@ibr.cs.tu-bs.de






















<span class="grey">Levi &amp; Schoenwaelder        Standards Track                    [Page 24]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-25" ></span>
<span class="grey"><a href="./rfc2591">RFC 2591</a>                     Scheduling MIB                     May 1999</span>


<span class="h2"><a class="selflink" id="section-11" href="#section-11">11</a>.  Full Copyright Statement</span>

   Copyright (C) The Internet Society (1999).  All Rights Reserved.

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Acknowledgement

   Funding for the RFC Editor function is currently provided by the
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